High IQ doesn't directly mean that this person can predict what is happening next, not even in trading.
Highly intelligent people will not be trading to make money. They will actually be the owner of the exchange or the creator of the project.
In trading, we can never tell when the market will turn good or bad, it is affected by many aspects like political, economy or the company's problem or news that affect their stock price.
It depends on the FUD but this is sometimes predictable and if people have fund lined up in the proper place they might be able to make money. Something called arbitrage trading comes into help during such period.
Even those experienced trader, they cannot predict what is going to happen next too.
With experience it becomes possible but no absolute prediction can be done.
I may say, higher IQ can help a person gain success in trading in faster. They may find faster and easier about the knowledge on trading.
This is relative. It depends on the person's interest in trading and their experience. They dont have any direct link.